Out of Love - 7 others. However, I was the first and I was alone for two weeks.
Raiders of the Lost Forums - 13 others.
Popular Link - 21 others but only 15 unique users have obtained it, including myself.
Respected - 27 others.
Gives Back - 35 others.
Licensed - 37 others.

I have Out of Love, Gives Back, Higher Love, which only two other people have, and Empathic.
And speaking of the Empathic badge, does it count liked pms? If it doesn’t, then I have absolutely no idea how I got it.